update linter settings

.golangci.yml

@@ -6,3 +6,6 @@ linters:
   - gofmt
   - golint
   - misspell
+
+issues:
+  exclude-use-default: false

internal/logger/logger.go

@@ -13,14 +13,13 @@ import (
 // Level is a log level.
 type Level int
 
+// Log levels.
 const (
 	Debug Level = iota
 	Info
 	Warn
 )
 
-// Log levels.
-
 // Destination is a log destination.
 type Destination int
 
@@ -102,6 +101,7 @@ func itoa(buf *[]byte, i int, wid int) {
 	*buf = append(*buf, b[bp:]...)
 }
 
+// Log writes a log entry.
 func (lh *Logger) Log(level Level, format string, args ...interface{}) {
 	if level < lh.level {
 		return